NMR + X-ray crystallographic methods

I am revising for my finals on Methods for studying proteins and DNA. I need
some references for mass spectroscopy, NMR, X-ray crystallography and Edman
methods. Principally, i need to know each of the methods' principles, teh
advantages/disadvanages, limitations.
if anyone knows any good reviews on the above methods, can they please send an
email to me and inform me please.
thank
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